CN116088590A - Distributed control system suitable for variable flow chilled water of secondary pump of data center - Google Patents
Distributed control system suitable for variable flow chilled water of secondary pump of data center Download PDFInfo
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- CN116088590A CN116088590A CN202211685433.6A CN202211685433A CN116088590A CN 116088590 A CN116088590 A CN 116088590A CN 202211685433 A CN202211685433 A CN 202211685433A CN 116088590 A CN116088590 A CN 116088590A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention belongs to the technical field of control, and particularly relates to a distributed control system suitable for variable flow chilled water of a secondary pump of a data center. The invention aims at the variable flow chilled water system of the secondary pump, integrates the information of each link by adopting a plurality of controllers, realizes the whole process monitoring of cold preparation, cold conveying and cold distribution, ensures that the cold monitoring is more accurate, has better utilization effect, and reduces the energy consumption.
Description
Technical Field
The invention belongs to the technical field of control, and particularly relates to a distributed control system suitable for variable flow chilled water of a secondary pump of a data center.
Background
The two-stage pump variable flow system is more suitable for the conditions of large system, large difference of load characteristics of air conditioners of all loops or great difference of resistance (such as high-rise buildings and long-distance conveying systems). At present, a two-stage pump variable flow system is mostly adopted in a large-scale data center.
The electric equipment of the water cooling system of the data center mainly comprises a water chilling unit, a primary pump, a secondary pump, a precise air conditioner and the like. The water chilling unit has high power and high energy consumption, and the circulating pump and the precise air conditioner need to run for a long time, so the water cooling system is a large energy consumption user of the data center. The traditional data center two-stage pump variable flow chilled water system is an independent system, and a water chilling unit control, a primary pump speed regulation control and a secondary pump speed regulation control are respectively provided with independent controllers according to hydraulic design working conditions of the system, so that the system control lacks coordination, the information transmission is unsmooth, and the overall optimal control effect is difficult to achieve.
Disclosure of Invention
In view of the above, the invention aims to provide a distributed control system suitable for variable flow chilled water of a secondary pump of a data center, and the distributed control system is used for the variable flow chilled water system of the secondary pump, and by adopting a plurality of controllers, information of each link is fused, so that the whole process monitoring from cold preparation, cold conveying and cold distribution is realized, the cold monitoring is more accurate, the utilization effect is better, and the energy consumption is reduced.
In order to achieve the above purpose, the technical scheme of the distributed control system suitable for the variable flow chilled water of the secondary pump of the data center is as follows:
a distributed control system suitable for variable flow chilled water of a secondary pump of a data center comprises a chiller, a primary pump control unit, a secondary pump control unit, a single machine room precise air conditioner control unit, a movable ring system interface and the data center, wherein the control units are connected by adopting a ring network structure;
the cooling machine and the primary pump control unit control a plurality of cooling machines and a plurality of primary pumps of the whole data center, so as to realize variable frequency control of the primary pumps and group control of the cooling machines;
the secondary pump control unit adopts two PLC controllers which are mutually standby, and when one is damaged, the function of the control unit is not affected; the secondary pump variable flow chilled water is provided with a plurality of secondary pumps, the secondary pump control unit performs group control on the plurality of secondary pumps, and the number of pumps participating in circulation and the frequency of the pumps are adjusted according to the pressure or other conditions required by the tail end;
the data center is composed of a plurality of module machine rooms, a single machine room is provided with a plurality of precise air conditioners, a precise air conditioner control unit is used for carrying out centralized control on the plurality of precise air conditioners of a certain machine room, recycling of the air conditioners is achieved, and the distribution of the temperature in the machine room modules is obtained through communication with a power environment system arranged in the machine room, so that the air conditioners are started and stopped in a targeted mode, the temperature control is more precise, and the problem that the machine room cabinet is locally overheated is solved.
Preferably, the system further comprises an upper computer monitoring unit, wherein the upper computer monitoring unit is respectively connected with the secondary pump control unit and the machine room precise air conditioner control unit.
Compared with the prior art, the invention has the beneficial effects that:
the invention aims at the variable flow chilled water system of the secondary pump, integrates the information of each link by adopting a plurality of controllers, realizes the whole process monitoring of cold preparation, cold conveying and cold distribution, ensures that the cold monitoring is more accurate, has better utilization effect, and reduces the energy consumption.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a control diagram of a chiller control unit;
fig. 3 is a control diagram of the secondary pump control unit.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
In order to better understand the embodiments of the present application, the following description will clearly and completely describe the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
1-3, a distributed control system suitable for variable flow chilled water of a secondary pump of a data center comprises a chiller, a primary pump control unit, a secondary pump control unit, a single machine room precise air conditioner control unit, a movable ring system interface and the data center, wherein the control units are connected by adopting a ring network structure;
the cooling machine and the primary pump control unit control a plurality of cooling machines and a plurality of primary pumps of the whole data center, so as to realize variable frequency control of the primary pumps and group control of the cooling machines;
the main control strategy is as follows:
1. in order to ensure the normal operation of the system, at least one cold machine is started to participate in refrigeration in a minimum mode;
2. judging the water chilling units capable of participating in group control: the cold machine operates in an automatic mode, the cold machine has no fault, the cold machine is not in an operating state, the cold machine is not manually isolated, the cold machine is longer than the allowed starting interval time when in shutdown, and the corresponding primary pump has no fault;
3. according to the relation of the balance of the cooling capacity supply and demand, the number of the water chilling units participating in refrigeration is adjusted, the machine is added and subtracted, and when the cooling capacity provided by the water chilling units is smaller than a certain proportion of the cooling capacity required by the air conditioner load, the machine adding operation is carried out; when the cooling capacity provided by the water chilling unit is smaller than the cooling capacity required by the air conditioner load by a certain proportion, performing the operation of reducing the cooling capacity;
4. adding and subtracting machine strategies: when the operation of adding machines is needed, a cold water unit with short starting operation time is preferentially selected from the cold machines capable of participating in group control, and when the operation of subtracting machines is needed, a cold water unit with long closing operation time is preferentially selected from the cold machines capable of participating in group control, so that the total operation duration of each unit is kept approximate;
5. judging the balance of cold energy supply and demand and adding and subtracting machine conditions:
a. judging according to the water flow direction and the flow rate of the balance pipe, judging that the supplied cold amount is larger than the load demand cold amount when the water flow flows from the water supply to the backwater and the flow rate is 110% of the water flowing through the single water chilling unit, otherwise, judging that the supplied cold amount is larger than the load demand cold amount and smaller than the load cold amount when the water flow flows from the backwater to the water supply and the flow rate is 20% of the water flowing through the single water chilling unit;
b. judging according to the operation quantity of the precise air conditioner, judging that the supplied cold quantity is larger than the load demand cold quantity when the operation quantity reduction duty ratio of the precise air conditioner is smaller than the corresponding cold machine reduction duty ratio in a period of time, and carrying out machine reduction, otherwise, judging that the supplied cold quantity is smaller than the load cold quantity when the operation quantity increase duty ratio of the precise air conditioner is larger than the corresponding cold machine increase duty ratio, and carrying out machine addition;
c. and judging according to the opening degree of each precise air conditioner water supply valve, judging that the supplied cold amount is larger than the load demand cold amount when the opening degree of the 80% number water supply valves of the precise air conditioner currently running is smaller than 40%, subtracting the machine, and judging that the supplied cold amount is smaller than the load demand cold amount when the opening degree of the 80% number water supply valves of the precise air conditioner currently running is larger than 70%, adding the machine.
The three conditions are operated when any one is satisfied.
6. Control during start and stop of the cold machine: when the cold machine is started, the corresponding primary pump is started firstly, after the primary pump operates for 3 minutes, the corresponding cold machine is started, otherwise, when the cold machine needs to be stopped, the cold machine is closed firstly, and after three minutes of time delay, the corresponding primary pump is closed. Such a control strategy is to prevent freezing out of chiller equipment.
The secondary pump control unit adopts two PLC controllers which are mutually standby, and when one is damaged, the function of the control unit is not affected; the secondary pump variable flow chilled water is provided with a plurality of secondary pumps, the secondary pump control unit performs group control on the plurality of secondary pumps, and the number of pumps participating in circulation and the frequency of the pumps are adjusted according to the pressure or other conditions required by the tail end;
the main control strategy is as follows:
1. in order to ensure the normal operation of the system, a secondary pump is started at least in a minimum mode, and the water supply circulation is maintained;
2. judgment of secondary pumps capable of participating in group control: the secondary pump operates in an automatic mode, the secondary pump has no fault, and the secondary pump is not in an operating state;
3. controlling the number and frequency of the operation of the water pump according to the pressure difference signal (such as the set value of 0.1 MPa) of the water supply and return water at the least adverse loop at the tail end, and performing frequency conversion and pump adding and subtracting operation;
4. pump initialization frequency: considering the efficiency of the frequency converter and the heating problem of the motor at low speed, the variable speed adjustment should be set to be at the lowest speed, namely the lowest frequency, here set to be 30Hz, namely the frequency given by the controller is 30Hz when a circulating pump is started newly;
5. frequency conversion, and pump adding and subtracting strategies:
a. end differential pressure control method: when the pressure difference between the water supply and the water return at the least disadvantageous loop at the tail end is too small, if the frequency of the currently operated pump is not full frequency (< 50 Hz), the frequency increasing operation is firstly carried out, when the frequency is increased to 50Hz full frequency, the control target is not improved in a preset detection period, when the pump adding operation is carried out, the secondary pump with short operation time is preferentially selected from the secondary pumps capable of participating in group control, when the pressure difference between the water supply and the water return at the least disadvantageous loop at the tail end is too large, the water supply pressure is required to be reduced, the frequency reducing operation is firstly carried out on the secondary pump with long operation time, when the frequency is reduced to 30Hz full frequency, the pump reducing operation is carried out in a preset detection period, and the control target is not improved, so that the water pump is closed.
Since the end of the hydraulic system is not well defined at the most unfavorable loop, the control according to the pressure difference cannot be accurate, so the control is combined with the opening degree of the water supply valve of the second precise air conditioner.
b. Air conditioner opening control method
Firstly, determining a hydraulic balance condition, namely finding a balance corresponding relation between the total frequency of each secondary pump and the total opening of the running precise air conditioner, and then controlling according to respective change rates.
Total frequency calculation of m secondary pumps:
/>
calculating the total opening of n precise air conditioners:
the initial correspondence between the total frequency of each secondary pump and the total opening of each precise air conditioner can be obtained as follows. If the number of the secondary pumps is designed to be m (without standby), the total number of the precise air conditioners is designed to be n, the total frequency of the secondary pumps is 50mHz, the total opening of the precise air conditioners is 100n%, the frequency corresponding to the unit opening is 50m/nHz, the total output frequency of the secondary pumps can be obtained according to the opening of the actual running air conditioner, and the total output frequency of the secondary pumps can be controlled in real time according to opening conversion by setting a reasonable control period.
The two control strategies are combined, an opening control method is preferentially used, when the communication between the fault and the precise air conditioner is lost, the total opening data of the precise air conditioner is lost, the frequency output by the opening control method is smaller, and the differential pressure control method is used for correction.
The data center is composed of a plurality of module machine rooms, a single machine room is provided with a plurality of precise air conditioners, a precise air conditioner control unit is used for carrying out centralized control on the plurality of precise air conditioners of a certain machine room, recycling of the air conditioners is achieved, and the distribution of the temperature in the machine room modules is obtained through communication with a power environment system arranged in the machine room, so that the air conditioners are started and stopped in a targeted mode, the temperature control is more precise, and the problem that the machine room cabinet is locally overheated is solved.
The main control strategy is as follows:
1. in order to ensure the temperature of the machine room module, at least one precise air conditioner is started for refrigeration in a minimum mode;
2. controlling the number of precise running and the operations of adding and subtracting the air conditioner according to the opening degree of a water supply valve of the precise air conditioner and the temperature in a machine room;
3. and (3) adding and subtracting strategies of the air conditioner:
and (3) an integral machine adding strategy: when the average opening degree of the water valves of all the current air conditioners is larger than a certain value (for example, more than 80), starting timing, and after a certain timing period, increasing the average value of the temperature of the machine room by a certain value, at the moment, performing the air conditioner adding operation, at the moment, ending the timing, and continuing timing and controlling the circulation period when the conditions are met; when the machine adding operation is needed, a water chilling unit with short starting operation time is preferentially selected from air conditioners capable of participating in group control
And (3) an overall machine reduction strategy: when the average opening degree of the water valves of all the current air conditioners is smaller than a certain value (for example, less than 30), starting timing, and reducing the average value of the temperature of a machine room by a certain value after a certain timing period, at the moment, performing air conditioner subtracting operation, at the moment, ending the timing, and continuing timing and circulating operation when the conditions are met; when the operation of reducing the machine is needed, the air conditioner with long running time is preferentially selected to be closed from the air conditioners which can participate in group control, so that the running total duration of each air conditioner is kept approximate.
Local adding and subtracting machine control strategy: the temperature sensors in the machine room are generally arranged in the direction of the machine cabinet, the arrangement direction of the precise air conditioner is the same as the arrangement direction of the machine cabinet, and the precise air conditioner is in a nearly one-to-one correspondence relation, when the average temperature of a certain row of machine cabinets is too high, and when the average temperature exceeds a certain value of the whole average temperature of the machine room, the heating of the IT equipment of the row of machine cabinets is proved to be too much, so that local overheating is caused. At this time, when the control system executes the air conditioner adding machine, the running time factor is not considered, the precise air conditioner corresponding to the cabinet of the row is preferentially increased, and similarly, when the average value of the temperature of a certain row is lower than the overall average value, if the machine is executed to reduce, the precise air conditioner corresponding to the cabinet of the row is running, and is preferentially closed.
The whole control strategy takes the whole machine adding and subtracting control strategy as a main part and takes the partial machine adding and subtracting strategy as an auxiliary part, so that the operation time of each precise air conditioner is balanced, and the problem of partial overheat of a machine room is solved.
The system also comprises an upper computer monitoring unit which is respectively connected with the secondary pump control unit and the machine room precise air conditioner control unit.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The distributed control system suitable for the variable flow chilled water of the secondary pump of the data center is characterized by comprising a chiller, a primary pump control unit, a secondary pump control unit, a single machine room precise air conditioner control unit, a movable ring system interface and the data center, wherein the control units are connected by adopting a ring network structure;
the cooling machine and the primary pump control unit control a plurality of cooling machines and a plurality of primary pumps of the whole data center, so as to realize variable frequency control of the primary pumps and group control of the cooling machines;
the secondary pump control unit adopts two PLC controllers which are mutually standby, and when one is damaged, the function of the control unit is not affected; the secondary pump variable flow chilled water is provided with a plurality of secondary pumps, the secondary pump control unit performs group control on the plurality of secondary pumps, and the number of pumps participating in circulation and the frequency of the pumps are adjusted according to the pressure or other conditions required by the tail end;
the data center is composed of a plurality of module machine rooms, a single machine room is provided with a plurality of precise air conditioners, a precise air conditioner control unit is used for carrying out centralized control on the plurality of precise air conditioners of a certain machine room, recycling of the air conditioners is achieved, and the distribution of the temperature in the machine room modules is obtained through communication with a power environment system arranged in the machine room, so that the air conditioners are started and stopped in a targeted mode, the temperature control is more precise, and the problem that the machine room cabinet is locally overheated is solved.
2. The distributed control system suitable for variable flow chilled water of a secondary pump of a data center according to claim 1, further comprising an upper computer monitoring unit, wherein the upper computer monitoring unit is respectively connected with the secondary pump control unit and the machine room precise air conditioner control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211685433.6A CN116088590A (en) | 2022-12-27 | 2022-12-27 | Distributed control system suitable for variable flow chilled water of secondary pump of data center |
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| CN202211685433.6A CN116088590A (en) | 2022-12-27 | 2022-12-27 | Distributed control system suitable for variable flow chilled water of secondary pump of data center |
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| CN202211685433.6A Pending CN116088590A (en) | 2022-12-27 | 2022-12-27 | Distributed control system suitable for variable flow chilled water of secondary pump of data center |
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